build(package.json): add 快捷命令

package.json

@@ -29,6 +29,7 @@
     "dev": "uni",
     "dev:h5": "uni",
     "dev:h5:ssr": "uni --ssr",
+    "dev:mp": "uni -p mp-weixin",
     "dev:mp-alipay": "uni -p mp-alipay",
     "dev:mp-baidu": "uni -p mp-baidu",
     "dev:mp-jd": "uni -p mp-jd",
@@ -45,8 +46,10 @@
     "build:app-ios": "uni build -p app-ios",
     "build:custom": "uni build -p",
     "build:h5": "uni build",
+    "build": "uni build",
     "build:h5:ssr": "uni build --ssr",
     "build:mp-alipay": "uni build -p mp-alipay",
+    "build:mp": "uni build -p mp-weixin",
     "build:mp-baidu": "uni build -p mp-baidu",
     "build:mp-jd": "uni build -p mp-jd",
     "build:mp-kuaishou": "uni build -p mp-kuaishou",